Give a proper build system for each sysmodule, k11ext, arm11.

Previously, these Makefiles didn't correctly track header changes.
The project doesn't build as a whole, future commits will fix it.

k11_extension/source/start.s

@@ -50,6 +50,8 @@ start:
 
     push {r0-r12, lr}
 
+    bl __libc_init_array
+
     sub r0, r4, #8
     sub r1, r8, #0x8000
     bl main